wearing 510's in size 33, I ordered sz31 PS and guess what..I can easily button them up because their real waist (measured as should) is 32,5. Is this normal?? Now I have to get them exchanged, just dont know what size to get now, 30 or 29 because I need inseam 34 or more

Just got a pair of NC and the waist and thighs are tight but its how i like it but the calves are really really tight like hugging my calf. How can i stretch out the calves so they expand? the leg opening is fine, its just the knee through the calves that are tight. I also heard that apcs stretch even more when there wet?thanks